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February 3-6 Plains/Midwest Storm


okie333

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Just wondering if the cold air will actually be in place for it to snow in Oklahoma. We should have the moisture, but this looks to be about our only chance of a decent winter storm. I hope we can get a little colder!

00z GFS says probably not.

We'll see though, I haven't looked at the full temp profile and everything because it's still pretty far out.

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I am watching, closely. 12Z GGEM had a freak dream run for portions of NE into the Front Range. These have a tendency to dig farther S than progged, however, hence why I am not buying the GGEM/GFS yet given the latest ECMWF solutions.

Certainly an interesting situation, and one with the potential to give someone some pretty impressive snowfall totals. It seems like the strength of the +PNA ridge and timing of the ridge wave-breaking (fold-over ridge scenario) will have significant ramifications as to where and how long this storm system cuts off. The way I see it, the ridge will be "shielding" the cut-off low from any kickers, while some fairly impressive baroclincity fuels warm-air advection type precip out ahead of the low.

At this point, things can still easily go wrong. If the ridge does not fold over quickly enough, the cutoff will become re-absorbed by the jet before heavy snow can accumulate. On the other hand, if the trough digs too far south, it quickly moderates in a warmer airmass, the T-gradient diminishes, and snow only falls over the higher terrain of S CO and NM.

The 12Z GFS would be ideal for the western 2/3 of NE:

post-378-0-66273500-1327947414.gif

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FINAL...

MADE ONLY COSMETIC CHANGES TO THE UPDATE PACKAGE FOR THE FINAL

ISSUANCE. THE 12Z/30 GUIDANCE WAS JUST AS CHAOTIC AS THE 00Z/30

CYCLE...WITH NO MODEL TO MODEL NOR RUN TO RUN CONTINUITY. AT

LEAST THE 12Z/30 GEFS MEAN WAS SUPPORTIVE OF THE MANUAL

BLEND...INDICATING THE PASSAGE OF THE SIGNIFICANT SYNOPTIC WAVE

SOUTH OF THE OHIO VALLEY DAY 5. CONFIDENCE REMAINS LOW.

Edit to add my post from Adam's Medium Range thread on the main page:

The HPC has a lot of interest in the Pacific at this time. And possible additional G-IV/C-130 missions has been tasked as well as the 2 C-130 missions from Alaska.

NOUS42 KNHC 301730

WEATHER RECONNAISSANCE FLIGHTS

CARCAH, NATIONAL HURRICANE CENTER, MIAMI, FL.

1230 PM EST MON 30 JANUARY 2012

SUBJECT: WINTER STORM PLAN OF THE DAY (WSPOD)

VALID 31/1100Z JANUARY TO 01/1100Z FEBRUARY 2012

WSPOD NUMBER.....11-061

I. ATLANTIC REQUIREMENTS

1. NEGATIVE RECONNAISSANCE REQUIREMENTS.

2. OUTLOOK FOR SUCCEEDING DAY.....NEGATIVE.

II. PACIFIC REQUIREMENTS

1. FLIGHT ONE -- TEAL 71

A. P55/ DROP 9 (45.0N 157.0W)/ 01/0000Z

B. AFXXX 09WSC TRACK55

C. 31/1830Z

D. 16 DROPS AS PUBLISHED ON TRACK

E. AS HIGH AS POSSIBLE/ 01/0600Z

FLIGHT TWO -- NOAA 49

A. P55/ DROP 9 (45.0N 157.0W)/ 01/1200Z

B. NOAA9 10WSC TRACK55

C. 01/0730Z

D. 16 DROPS AS PUBLISHED ON TRACK

E. 41,000 TO 45,000 FT/ 01/1800Z

2. SUCCEEDING DAY OUTLOOK:

A. POSSIBLE TEAL C-130J MISSION FOR

P56/ DROP 9 (44.3N 151.0W)/ 02/0000Z.

B. POSSIBLE NOAA G-IV MISSION FOR

P56/ DROP 9 (44.3N 151.0W)/ 02/1200Z.

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I might be the first person on this board to see flakes from this storm. I hope it's over an inch.

The 18z GFS and 12z GFS show different scenarios for snowfall, with the 18z showing a large snowfall for the Colorado north plains.

12z GFS shows the main heavy snowfall will be in north central Nebraska.

12z GFS and 18z GFS both deepen the 500mb low at the CO/KS border at 12z-18z Friday. So I am still wondering as to the reason for the big differences between the QPF. It must be on some maps I haven't looked at yet.

Wasn't it just a few days ago that it looked like the models showed the bad weather action would shift to the Ohio Valley and Colorado was in a huge ridge? Well the huge ridge may have to wait for a blizzard-like trough first.

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18z GFS continues the dumping on NE and Baro country.

The ggem dumps over 2.50 qpf on baro but he's waiting for the euro to cave to the gfs before he gets pumped. :lol:

I am actually quite excited about this threat...first legit real winter threat here in months. And for once, the GOM is actually wide open. It is really going to come down to how rapidly the eastern Pacific Ridge builds in behind this wave...and the intensity of the lead PV anomaly ejecting into the plains. We need both to be right given the overall positive tilt nature to the mean trough. Given the track record of this year, both of those happening at the same time are slim. ECMWF, even though it has not been handling the overall evolution very well, still suggests a southern track. Even with the GGEm/GFS solutions, I won't get too excited yet.

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is this storm going to do anyting in NM?

Northern NM is in the same boat as much of the remainder of the region...it is highly dependent on the strength of the lead PV anomaly and how rapid the deepening is. Given the incredible moist fetch off the GOM, there is going to be significant positive feedback potential, but it is dependent on that anomaly. GFS/GGEM would support a defo band into the northern NM region whereas a weaker solution like the NAM/ECMWF would be high elevation upslope only...wind elsewhere.

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Northern NM is in the same boat as much of the remainder of the region...it is highly dependent on the strength of the lead PV anomaly and how rapid the deepening is. Given the incredible moist fetch off the GOM, there is going to be significant positive feedback potential, but it is dependent on that anomaly. GFS/GGEM would support a defo band into the northern NM region whereas a weaker solution like the NAM/ECMWF would be high elevation upslope only...wind elsewhere.

thanks, i'm assuming this would be around feb 2nd for my area?

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I am actually quite excited about this threat...first legit real winter threat here in months. And for once, the GOM is actually wide open. It is really going to come down to how rapidly the eastern Pacific Ridge builds in behind this wave...and the intensity of the lead PV anomaly ejecting into the plains. We need both to be right given the overall positive tilt nature to the mean trough. Given the track record of this year, both of those happening at the same time are slim. ECMWF, even though it has not been handling the overall evolution very well, still suggests a southern track. Even with the GGEm/GFS solutions, I won't get too excited yet.

euro caved to the ggem/gfs.

LBF

FRI 00Z 03-FEB   5.3	 4.0	1016	  66	  92	0.01	 558	 544  
FRI 06Z 03-FEB   1.7	 1.0	1022	  87	  98	0.02	 558	 540  
FRI 12Z 03-FEB  -0.2	-0.8	1024	  92	  93	0.07	 558	 538  
FRI 18Z 03-FEB   1.2	-2.1	1026	  81	 100	0.08	 559	 538  
SAT 00Z 04-FEB   1.5	-2.1	1025	  87	 100	0.08	 559	 538  
SAT 06Z 04-FEB  -0.6	-4.3	1027	  78	  95	0.07	 558	 536  
SAT 12Z 04-FEB  -2.6	-5.3	1029	  89	  98	0.19	 556	 533  
SAT 18Z 04-FEB  -2.8	-5.7	1031	  88	 100	0.27	 556	 531  
SUN 00Z 05-FEB  -2.2	-5.7	1031	  81	 100	0.10	 556	 531  
SUN 06Z 05-FEB  -2.8	-6.3	1033	  82	 100	0.04	 556	 530  
SUN 12Z 05-FEB  -4.1	-6.0	1033	  79	  99	0.03	 556	 530  
SUN 18Z 05-FEB  -2.9	-6.1	1034	  77	 100	0.03	 556	 529  
MON 00Z 06-FEB  -4.0	-5.0	1030	  71	  98	0.01	 554	 530	

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euro caved to the ggem/gfs.

FRI 00Z 03-FEB   5.3	 4.0	1016	  66	  92	0.01	 558	 544  
FRI 06Z 03-FEB   1.7	 1.0	1022	  87	  98	0.02	 558	 540  
FRI 12Z 03-FEB  -0.2	-0.8	1024	  92	  93	0.07	 558	 538  
FRI 18Z 03-FEB   1.2	-2.1	1026	  81	 100	0.08	 559	 538  
SAT 00Z 04-FEB   1.5	-2.1	1025	  87	 100	0.08	 559	 538  
SAT 06Z 04-FEB  -0.6	-4.3	1027	  78	  95	0.07	 558	 536  
SAT 12Z 04-FEB  -2.6	-5.3	1029	  89	  98	0.19	 556	 533  
SAT 18Z 04-FEB  -2.8	-5.7	1031	  88	 100	0.27	 556	 531  
SUN 00Z 05-FEB  -2.2	-5.7	1031	  81	 100	0.10	 556	 531  
SUN 06Z 05-FEB  -2.8	-6.3	1033	  82	 100	0.04	 556	 530  
SUN 12Z 05-FEB  -4.1	-6.0	1033	  79	  99	0.03	 556	 530  
SUN 18Z 05-FEB  -2.9	-6.1	1034	  77	 100	0.03	 556	 529  
MON 00Z 06-FEB  -4.0	-5.0	1030	  71	  98	0.01	 554	 530	

Where is that at?

Just curious...what does it do for Denver?

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Where is that at?

Just curious...what does it do for Denver?

that is for LBF.

DEN data via euro

FRI 06Z 03-FEB  -1.2    -1.0    1025      80      95    0.04     555     535    
FRI 12Z 03-FEB  -3.3    -3.2    1028      80     100    0.11     554     532    
FRI 18Z 03-FEB  -3.9    -3.6    1030      80     100    0.29     556     531    
SAT 00Z 04-FEB  -3.9    -3.4    1030      88      99    0.34     556     532    
SAT 06Z 04-FEB  -4.2    -3.8    1032      91     100    0.35     556     531    
SAT 12Z 04-FEB  -4.6    -4.2    1033      92      99    0.29     556     530    
SAT 18Z 04-FEB  -4.6    -4.4    1035      90      99    0.15     558     530    
SUN 00Z 05-FEB  -5.0    -4.4    1034      90      98    0.05     558     530    
SUN 06Z 05-FEB  -8.7    -5.2    1035      95      91    0.01     558     530    

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